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This is a 2-way ball valve assembly from Johnson Controls' 603 Series, built for hot or chilled water and up to 50% glycol in fan coil units, convectors, unit conditioners, radiation and reheat coils. It pairs a normally open, fail-safe actuator with 2-10 Vdc proportional control, so the valve drives closed on power loss and modulates with a 0-10 V or 2-10 V building controller. It holds 200 psi close-off, which suits most hydronic terminal units. Against basic on/off zone valves, it adds proportional modulation and fail-safe operation; against larger globe-valve assemblies, it is a simpler, lower-flow terminal-unit valve rather than a main-plant control valve.
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Lowest price we've seen: $168.12 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
The 172J-10308 is a 603 Series 2-way ball valve with an actuator assembly. It controls hot or chilled water and glycol solutions of up to 50% in convectors, fan coil units, unit conditioners, radiation and reheat coils.
The actuator takes a 2-10 Vdc control signal. It is normally open and fail safe, and it provides 200 psi close-off.